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this bit is used by the PE kernel to decide whether to run the Fujitsu Softune
Monitor or not. When MSEL='0', the Softune monitor will be run,
otherwise (MSEL='1') the PE kernel remain active.
[Bit 1] UKIE – when '1', pressing the User Key button (or switching the
User Key DIP switch ON) will produce a 25ms pulse on the INT0 CPU
signal. When both UKIE = '0' and (BONRD='0' and BONWR='0'), the INT0
CPU signal stays in high impedance state with only 47k pullup connected to
it.
[Bit 2] UKI – this bit can used to distinguish, if the INT0 interrupt was
caused by the User Key or the Hardware Breakpoint (or both, see Hardware
Breakpoint Control register). If UKI=1, the interrupt was caused by the User
Key. If both UKI and HBI (see the Hardware Breakpoint Control register)
are log. '1', the interrupt was caused by both pressing the User Key and the
Hardware breakpoint.
[Bit 3] UKEY – this bit indicates the status of the User Key Button.
Read:
0: The user key is not pressed
1: The user key is pressed
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